Normally, dogs will not catch a cold if they sleep on the ground in summer. However, if the ground is too cold, the dog may catch a cold, so it is best not to let the dog sleep directly on the ground, especially if it is under three months old. puppies. In summer, lay a paper shell for your dog on the ground to prevent the ground from getting too cold, and don't let your dog sleep in a windy place. At the same time, you should also prepare enough water for your dog, which can also help your dog cool down.